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ISIM $f___ syntax

Hi! I use ISE WebPack 11.2 and ISIM 11.2, L46 and UserGuide say $fopen, $fread, $fwrite and $fclose are supported, but i cannot find syntax for this file i/o task (like other one). Can you help me with some links with more information about syntax (applicable for ISIM 11.2)? Thank you!

Re: ISIM $f___ syntax

ok, IEEE Std 1364-2001 is the true document. Now the problem is: I open file, successfully, and try to read from file (using file pointer, returned from $fopen), but there is no data returned - status of operation is correct (return 1 byte readed). what's wrong? $ftell and $fseek works fine, but returned data from $fread still XX.